src/shape-editor.cpp

   1 #define __SHAPE_EDITOR_CPP__
   2
   3 /*
   4  * Inkscape::ShapeEditor
   5  *
   6  * Authors:
   7  *   bulia byak <buliabyak@users.sf.net>
   8  *
   9  */
  10
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14
  15 #include <string.h>
  16 #include <glibmm/i18n.h>
  17
  18 #include "sp-object.h"
  19 #include "sp-item.h"
  20 #include "live_effects/lpeobject.h"
  21 #include "selection.h"
  22 #include "desktop.h"
  23 #include "desktop-handles.h"
  24 #include "knotholder.h"
  25 #include "live_effects/parameter/point.h"
  26 #include "nodepath.h"
  27 #include "xml/node-event-vector.h"
  28 #include "preferences.h"
  29 #include "object-edit.h"
  30 #include "style.h"
  31 #include "display/curve.h"
  32 #include <2geom/pathvector.h>
  33
  34 #include "shape-editor.h"
  35
  36
  37 ShapeEditorsCollective::ShapeEditorsCollective(SPDesktop */*dt*/) {
  38 }
  39
  40 ShapeEditorsCollective::~ShapeEditorsCollective() {
  41 }
  42
  43
  44 void ShapeEditorsCollective::update_statusbar() {
  45
  46 //!!! move from nodepath: sp_nodepath_update_statusbar but summing for all nodepaths
  47
  48 }
  49
  50 ShapeEditor::ShapeEditor(SPDesktop *dt) {
  51     this->desktop = dt;
  52     this->grab_node = -1;
  53     this->nodepath = NULL;
  54     this->knotholder = NULL;
  55     this->hit = false;
  56     this->listener_attached_for = NULL;
  57 }
  58
  59 ShapeEditor::~ShapeEditor() {
  60     unset_item(SH_KNOTHOLDER);
  61     unset_item(SH_NODEPATH);
  62 }
  63
  64 void ShapeEditor::unset_item(SubType type, bool keep_knotholder) {
  65     Inkscape::XML::Node *old_repr = NULL;
  66
  67     switch (type) {
  68         case SH_NODEPATH:
  69             if (this->nodepath) {
  70                 old_repr = this->nodepath->repr;
  71                 if (old_repr && old_repr == listener_attached_for) {
  72                     sp_repr_remove_listener_by_data(old_repr, this);
  73                     Inkscape::GC::release(old_repr);
  74                     listener_attached_for = NULL;
  75                 }
  76
  77                 this->grab_node = -1;
  78                 delete this->nodepath;
  79                 this->nodepath = NULL;
  80             }
  81             break;
  82         case SH_KNOTHOLDER:
  83             if (this->knotholder) {
  84                 old_repr = this->knotholder->repr;
  85                 if (old_repr && old_repr == listener_attached_for) {
  86                     sp_repr_remove_listener_by_data(old_repr, this);
  87                     Inkscape::GC::release(old_repr);
  88                     listener_attached_for = NULL;
  89                 }
  90
  91                 if (!keep_knotholder) {
  92                     delete this->knotholder;
  93                     this->knotholder = NULL;
  94                 }
  95             }
  96             break;
  97     }
  98 }
  99
 100 bool ShapeEditor::has_nodepath () {
 101     return (this->nodepath != NULL);
 102 }
 103
 104 bool ShapeEditor::has_knotholder () {
 105     return (this->knotholder != NULL);
 106 }
 107
 108 void ShapeEditor::update_knotholder () {
 109     if (this->knotholder)
 110         this->knotholder->update_knots();
 111 }
 112
 113 bool ShapeEditor::has_local_change (SubType type) {
 114     switch (type) {
 115         case SH_NODEPATH:
 116             return (this->nodepath && this->nodepath->local_change);
 117         case SH_KNOTHOLDER:
 118             return (this->knotholder && this->knotholder->local_change != 0);
 119         default:
 120             g_assert_not_reached();
 121     }
 122 }
 123
 124 void ShapeEditor::decrement_local_change (SubType type) {
 125     switch (type) {
 126         case SH_NODEPATH:
 127             if (this->nodepath && this->nodepath->local_change > 0) {
 128                 this->nodepath->local_change--;
 129             }
 130             break;
 131         case SH_KNOTHOLDER:
 132             if (this->knotholder) {
 133                 this->knotholder->local_change = FALSE;
 134             }
 135             break;
 136         default:
 137             g_assert_not_reached();
 138     }
 139 }
 140
 141 const SPItem *ShapeEditor::get_item (SubType type) {
 142     const SPItem *item = NULL;
 143     switch (type) {
 144         case SH_NODEPATH:
 145             if (this->has_nodepath()) {
 146                 item = this->nodepath->item;
 147             }
 148             break;
 149         case SH_KNOTHOLDER:
 150             if (this->has_knotholder()) {
 151                 item = this->knotholder->getItem();
 152             }
 153             break;
 154     }
 155     return item;
 156 }
 157
 158 GList *ShapeEditor::save_nodepath_selection () {
 159     if (this->nodepath)
 160         return ::save_nodepath_selection (this->nodepath);
 161     return NULL;
 162 }
 163
 164 void ShapeEditor::restore_nodepath_selection (GList *saved) {
 165     if (this->nodepath && saved)
 166         ::restore_nodepath_selection (this->nodepath, saved);
 167 }
 168
 169 bool ShapeEditor::nodepath_edits_repr_key(gchar const *name) {
 170     if (nodepath && name) {
 171         return ( !strcmp(name, nodepath->repr_key) || !strcmp(name, nodepath->repr_nodetypes_key) );
 172     }
 173
 174     return false;
 175 }
 176
 177
 178 void ShapeEditor::shapeeditor_event_attr_changed(gchar const *name)
 179 {
 180     gboolean changed_np = FALSE;
 181     gboolean changed_kh = FALSE;
 182
 183     if (has_nodepath() && nodepath_edits_repr_key(name))
 184     {
 185         changed_np = !has_local_change(SH_NODEPATH);
 186         decrement_local_change(SH_NODEPATH);
 187     }
 188
 189     if (changed_np) {
 190         GList *saved = NULL;
 191         if (has_nodepath()) {
 192             saved = save_nodepath_selection();
 193         }
 194
 195         reset_item(SH_NODEPATH);
 196
 197         if (has_nodepath() && saved) {
 198             restore_nodepath_selection(saved);
 199             g_list_free (saved);
 200         }
 201     }
 202
 203     if (has_knotholder())
 204     {
 205         changed_kh = !has_local_change(SH_KNOTHOLDER);
 206         decrement_local_change(SH_KNOTHOLDER);
 207         if (changed_kh) {
 208             // this can happen if an LPEItem's knotholder handle was dragged, in which case we want
 209             // to keep the knotholder; in all other cases (e.g., if the LPE itself changes) we delete it
 210             reset_item(SH_KNOTHOLDER, !strcmp(name, "d"));
 211         }
 212     }
 213
 214     update_statusbar(); //TODO: get_container()->update_statusbar();
 215 }
 216
 217
 218 static void shapeeditor_event_attr_changed(Inkscape::XML::Node */*repr*/, gchar const *name,
 219                                            gchar const */*old_value*/, gchar const */*new_value*/,
 220                                            bool /*is_interactive*/, gpointer data)
 221 {
 222     g_assert(data);
 223     ShapeEditor *sh = ((ShapeEditor *) data);
 224
 225     sh->shapeeditor_event_attr_changed(name);
 226 }
 227
 228 static Inkscape::XML::NodeEventVector shapeeditor_repr_events = {
 229     NULL, /* child_added */
 230     NULL, /* child_removed */
 231     shapeeditor_event_attr_changed,
 232     NULL, /* content_changed */
 233     NULL  /* order_changed */
 234 };
 235
 236
 237 void ShapeEditor::set_item(SPItem *item, SubType type, bool keep_knotholder) {
 238     // this happens (and should only happen) when for an LPEItem having both knotholder and
 239     // nodepath the knotholder is adapted; in this case we don't want to delete the knotholder
 240     // since this freezes the handles
 241     unset_item(type, keep_knotholder);
 242
 243     this->grab_node = -1;
 244
 245     if (item) {
 246         Inkscape::XML::Node *repr;
 247         switch(type) {
 248             case SH_NODEPATH:
 249                 if (SP_IS_LPE_ITEM(item)) {
 250                     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 251                     this->nodepath = sp_nodepath_new(desktop, item, (prefs->getBool("/tools/nodes/show_handles", true)));
 252                 }
 253                 if (this->nodepath) {
 254                     this->nodepath->shape_editor = this;
 255
 256                     // setting new listener
 257                     repr = SP_OBJECT_REPR(item);
 258                     if (repr != listener_attached_for) {
 259                         Inkscape::GC::anchor(repr);
 260                         sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 261                         listener_attached_for = repr;
 262                     }
 263                 }
 264                 break;
 265
 266             case SH_KNOTHOLDER:
 267                 if (!this->knotholder) {
 268                     // only recreate knotholder if none is present
 269                     this->knotholder = sp_item_knot_holder(item, desktop);
 270                 }
 271                 if (this->knotholder) {
 272                     this->knotholder->update_knots();
 273                     // setting new listener
 274                     repr = this->knotholder->repr;
 275                     if (repr != listener_attached_for) {
 276                         Inkscape::GC::anchor(repr);
 277                         sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 278                         listener_attached_for = repr;
 279                     }
 280                 }
 281                 break;
 282         }
 283     }
 284 }
 285
 286 /** Please note that this function only works for path parameters.
 287 *  All other parameters probably will crash Inkscape!
 288 */
 289 void ShapeEditor::set_item_lpe_path_parameter(SPItem *item, SPObject *lpeobject, const char * key)
 290 {
 291     unset_item(SH_NODEPATH);
 292
 293     this->grab_node = -1;
 294
 295     if (lpeobject) {
 296         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 297         this->nodepath = sp_nodepath_new( desktop, lpeobject,
 298                                           (prefs->getInt("/tools/nodes/show_handles", true)),
 299                                           key, item);
 300         if (this->nodepath) {
 301             this->nodepath->shape_editor = this;
 302
 303             // setting new listener
 304             Inkscape::XML::Node *repr = SP_OBJECT_REPR(lpeobject);
 305             if (repr && repr != listener_attached_for) {
 306                 Inkscape::GC::anchor(repr);
 307                 sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 308                 listener_attached_for = repr;
 309             }
 310         }
 311     }
 312 }
 313
 314
 315 /** FIXME: This thing is only called when the item needs to be updated in response to repr change.
 316    Why not make a reload function in NodePath and in KnotHolder? */
 317 void ShapeEditor::reset_item (SubType type, bool keep_knotholder)
 318 {
 319     switch (type) {
 320         case SH_NODEPATH:
 321             if ( (this->nodepath) && (IS_LIVEPATHEFFECT(this->nodepath->object)) ) {
 322                 SPItem * item = this->nodepath->item;
 323                 SPObject *obj = this->nodepath->object;
 324                 char * key = g_strdup(this->nodepath->repr_key);
 325                 set_item_lpe_path_parameter(item, obj, key); // the above checks for nodepath, so it is indeed a path that we are editing
 326                 g_free(key);
 327             } else {
 328                 SPItem * item = (SPItem *) get_item(SH_NODEPATH);
 329                 set_item(item, SH_NODEPATH);
 330             }
 331             break;
 332         case SH_KNOTHOLDER:
 333             if (this->knotholder) {
 334                 SPItem * item = (SPItem *) get_item(SH_KNOTHOLDER);
 335                 set_item(item, SH_KNOTHOLDER, keep_knotholder);
 336             }
 337             break;
 338     }
 339 }
 340
 341 void ShapeEditor::nodepath_destroyed () {
 342     this->nodepath = NULL;
 343 }
 344
 345 void ShapeEditor::update_statusbar () {
 346     if (this->nodepath)
 347         sp_nodepath_update_statusbar(this->nodepath);
 348 }
 349
 350 bool ShapeEditor::is_over_stroke (Geom::Point event_p, bool remember) {
 351     if (!this->nodepath)
 352         return false; // no stroke in knotholder
 353
 354     const SPItem *item = get_item(SH_NODEPATH);
 355
 356     //Translate click point into proper coord system
 357     this->curvepoint_doc = desktop->w2d(event_p);
 358     this->curvepoint_doc *= sp_item_dt2i_affine(item);
 359
 360     SPCurve *curve = this->nodepath->curve;   // not sure if np->curve is always up to date...
 361     Geom::PathVector const &pathv = curve->get_pathvector();
 362     boost::optional<Geom::PathVectorPosition> pvpos = Geom::nearestPoint(pathv, this->curvepoint_doc);
 363     if (!pvpos) {
 364         g_print("Warning! Possible error?\n");
 365         return false;
 366     }
 367
 368     Geom::Point nearest = pathv[pvpos->path_nr].pointAt(pvpos->t);
 369     Geom::Point delta = nearest - this->curvepoint_doc;
 370
 371     delta = desktop->d2w(delta);
 372
 373     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 374     double stroke_tolerance =
 375         (( !SP_OBJECT_STYLE(item)->stroke.isNone() ?
 376            desktop->current_zoom() *
 377            SP_OBJECT_STYLE (item)->stroke_width.computed * 0.5 *
 378            to_2geom(sp_item_i2d_affine(item)).descrim()
 379          : 0.0)
 380          + prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100)) / to_2geom(sp_item_i2d_affine(item)).descrim();
 381     bool close = (Geom::L2 (delta) < stroke_tolerance);
 382
 383     if (remember && close) {
 384         // calculate index for nodepath's representation.
 385         double int_part;
 386         double t = std::modf(pvpos->t, &int_part);
 387         unsigned int segment_index = (unsigned int)int_part + 1;
 388         for (unsigned int i = 0; i < pvpos->path_nr; ++i) {
 389             segment_index += pathv[i].size() + 1;
 390             if (pathv[i].closed())
 391                 segment_index += 1;
 392         }
 393
 394         this->curvepoint_event[Geom::X] = (gint) event_p [Geom::X];
 395         this->curvepoint_event[Geom::Y] = (gint) event_p [Geom::Y];
 396         this->hit = true;
 397         this->grab_t = t;
 398         this->grab_node = segment_index;
 399     }
 400
 401     return close;
 402 }
 403
 404 void ShapeEditor::add_node_near_point() {
 405     if (this->nodepath) {
 406         sp_nodepath_add_node_near_point(this->nodepath, this->curvepoint_doc);
 407     } else if (this->knotholder) {
 408         // we do not add nodes in knotholder... yet
 409     }
 410 }
 411
 412 void ShapeEditor::select_segment_near_point(bool toggle) {
 413     if (this->nodepath) {
 414         sp_nodepath_select_segment_near_point(this->nodepath, this->curvepoint_doc, toggle);
 415     }
 416     if (this->knotholder) {
 417         // we do not select segments in knotholder... yet?
 418     }
 419 }
 420
 421 void ShapeEditor::cancel_hit() {
 422     this->hit = false;
 423 }
 424
 425 bool ShapeEditor::hits_curve() {
 426     return (this->hit);
 427 }
 428
 429
 430 void ShapeEditor::curve_drag(gdouble eventx, gdouble eventy) {
 431     if (this->nodepath && !this->nodepath->straight_path) {
 432
 433         if (this->grab_node == -1) // don't know which segment to drag
 434             return;
 435
 436         // We round off the extra precision in the motion coordinates provided
 437         // by some input devices (like tablets). As we'll store the coordinates
 438         // as integers in curvepoint_event we need to do this rounding before
 439         // comparing them with the last coordinates from curvepoint_event.
 440         // See bug #1593499 for details.
 441
 442         gint x = (gint) Inkscape::round(eventx);
 443         gint y = (gint) Inkscape::round(eventy);
 444
 445
 446         // The coordinates hasn't changed since the last motion event, abort
 447         if (this->curvepoint_event[Geom::X] == x &&
 448             this->curvepoint_event[Geom::Y] == y)
 449             return;
 450
 451         Geom::Point const delta_w(eventx - this->curvepoint_event[Geom::X],
 452                                   eventy - this->curvepoint_event[Geom::Y]);
 453         Geom::Point const delta_dt(this->desktop->w2d(delta_w));
 454
 455         sp_nodepath_curve_drag (this->nodepath, this->grab_node, this->grab_t, delta_dt);
 456         this->curvepoint_event[Geom::X] = x;
 457         this->curvepoint_event[Geom::Y] = y;
 458
 459     }
 460     if (this->knotholder) {
 461         // we do not drag curve in knotholder
 462     }
 463
 464 }
 465
 466 void ShapeEditor::finish_drag() {
 467     if (this->nodepath && this->hit) {
 468         sp_nodepath_update_repr (this->nodepath, _("Drag curve"));
 469     }
 470 }
 471
 472 void ShapeEditor::select_rect(Geom::Rect const &rect, bool add) {
 473     if (this->nodepath) {
 474         sp_nodepath_select_rect(this->nodepath, rect, add);
 475     }
 476 }
 477
 478 bool ShapeEditor::has_selection() {
 479     if (this->nodepath)
 480         return this->nodepath->selected;
 481     return false; //  so far, knotholder cannot have selection
 482 }
 483
 484 void ShapeEditor::deselect() {
 485     if (this->nodepath)
 486         sp_nodepath_deselect(this->nodepath);
 487 }
 488
 489 void ShapeEditor::add_node () {
 490     sp_node_selected_add_node(this->nodepath);
 491 }
 492
 493 void ShapeEditor::delete_nodes () {
 494     sp_node_selected_delete(this->nodepath);
 495 }
 496
 497 void ShapeEditor::delete_nodes_preserving_shape () {
 498     if (this->nodepath && this->nodepath->selected) {
 499         sp_node_delete_preserve(g_list_copy(this->nodepath->selected));
 500     }
 501 }
 502
 503 void ShapeEditor::delete_segment () {
 504     sp_node_selected_delete_segment(this->nodepath);
 505 }
 506
 507 void ShapeEditor::set_node_type(int type) {
 508     sp_node_selected_set_type(this->nodepath, (Inkscape::NodePath::NodeType) type);
 509 }
 510
 511 void ShapeEditor::break_at_nodes() {
 512     sp_node_selected_break(this->nodepath);
 513 }
 514
 515 void ShapeEditor::join_nodes() {
 516     sp_node_selected_join(this->nodepath);
 517 }
 518
 519 void ShapeEditor::join_segments() {
 520     sp_node_selected_join_segment(this->nodepath);
 521 }
 522
 523 void ShapeEditor::duplicate_nodes() {
 524     sp_node_selected_duplicate(this->nodepath);
 525 }
 526
 527 void ShapeEditor::set_type_of_segments(NRPathcode code) {
 528     sp_node_selected_set_line_type(this->nodepath, code);
 529 }
 530
 531 void ShapeEditor::move_nodes_screen(SPDesktop *desktop, gdouble dx, gdouble dy) {
 532     sp_node_selected_move_screen(desktop, this->nodepath, dx, dy);
 533 }
 534 void ShapeEditor::move_nodes(gdouble dx, gdouble dy) {
 535     sp_node_selected_move(this->nodepath, dx, dy);
 536 }
 537
 538 void ShapeEditor::rotate_nodes(gdouble angle, int which, bool screen) {
 539     if (this->nodepath)
 540         sp_nodepath_selected_nodes_rotate (this->nodepath, angle, which, screen);
 541 }
 542
 543 void ShapeEditor::scale_nodes(gdouble const grow, int const which) {
 544     sp_nodepath_selected_nodes_scale(this->nodepath, grow, which);
 545 }
 546 void ShapeEditor::scale_nodes_screen(gdouble const grow, int const which) {
 547     sp_nodepath_selected_nodes_scale_screen(this->nodepath, grow, which);
 548 }
 549
 550 void ShapeEditor::select_all (bool invert) {
 551     if (this->nodepath)
 552         sp_nodepath_select_all (this->nodepath, invert);
 553 }
 554 void ShapeEditor::select_all_from_subpath (bool invert) {
 555     if (this->nodepath)
 556         sp_nodepath_select_all_from_subpath (this->nodepath, invert);
 557 }
 558 void ShapeEditor::select_next () {
 559     if (this->nodepath) {
 560         sp_nodepath_select_next (this->nodepath);
 561         if (this->nodepath->numSelected() >= 1) {
 562             this->desktop->scroll_to_point(this->nodepath->singleSelectedCoords(), 1.0);
 563         }
 564     }
 565 }
 566 void ShapeEditor::select_prev () {
 567     if (this->nodepath) {
 568         sp_nodepath_select_prev (this->nodepath);
 569         if (this->nodepath->numSelected() >= 1) {
 570             this->desktop->scroll_to_point(this->nodepath->singleSelectedCoords(), 1.0);
 571         }
 572     }
 573 }
 574
 575 void ShapeEditor::show_handles (bool show) {
 576     if (this->nodepath && !this->nodepath->straight_path)
 577         sp_nodepath_show_handles (this->nodepath, show);
 578 }
 579
 580 void ShapeEditor::show_helperpath (bool show) {
 581     if (this->nodepath)
 582         sp_nodepath_show_helperpath (this->nodepath, show);
 583 }
 584
 585 void ShapeEditor::flip (Geom::Dim2 axis, boost::optional<Geom::Point> center) {
 586     if (this->nodepath)
 587         sp_nodepath_flip (this->nodepath, axis, center);
 588 }
 589
 590 void ShapeEditor::distribute (Geom::Dim2 axis) {
 591     if (this->nodepath)
 592         sp_nodepath_selected_distribute (this->nodepath, axis);
 593 }
 594 void ShapeEditor::align (Geom::Dim2 axis) {
 595     if (this->nodepath)
 596         sp_nodepath_selected_align (this->nodepath, axis);
 597 }
 598
 599
 600 /*
 601   Local Variables:
 602   mode:c++
 603   c-file-style:"stroustrup"
 604   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 605   indent-tabs-mode:nil
 606   fill-column:99
 607   End:
 608 */
 609 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :